module.js
let name = "tom";
let age = 20;
let phone = '13813661234'
let introduce = function(){
    return `My name is ${name}! I'm ${age} years old!`;
};

    export {name,age,phone,introduce};

    function foo(){
        console.log('foo');
    }
    function bar(){
        console.log('bar');
    }
    
    export {foo,bar};